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Marlin Front Sights
Size
Material
I make front sights in three sizes in either Brass or Blued Steel.  The two pictures show the sights in profile and from the back.  The width of the base of the sight is the distance from left to right of the width of the dovetail slot you have on your ramp or barrel.  

The first sight on the left in both pictures is designed to fit a 1/4" width dovetail slot on a ramp.  The middle sight fits a 3/8"  wide ramp and the sight on the right fits in a dovetail that is cut into the barrel.  
The standard height for the two ramp mounted sights is .450".  The barrel mounted sight is .650".  These sizes will give you plenty of height for any Marlin.  You can order a specific height if you wish at no extra charge.   

The front sight is made with a slightly oversize dovetail.  It will be necessary to use a small triangular file to fit it to the dovetail slot.  This is a 10 minute job if  you follow the directions below.







Fitting a front sight
 
Remove the front sight from the rifle using a brass punch and a mallet. Drift the sight from right to left

Hold the new sight to the left side of the slot and try to start the sight. If it will start then drift it into center position using the brass punch and mallet. If you cannot start it by hand, you will need to use a small triangular file to remove some metal. Very little filing will be necessary. File a couple of strokes then check. File only on the sloped side of the dovetail and only file on one of the two surfaces. The dovetail on the sight is made slightly oversize due to variations in width of the dovetail slot on the gun. The goal is a firm friction fit that cannot be moved by hand, but can be moved with gentle taps of a punch and mallet.

Front Sight Height Calculator
When you are unable to adjust the rear sight to work for your rifle because the rifle shoots high you will need a taller front sight. To eliminate the guesswork, you can calculate the additional height needed using the procedure below.

1. Shoot your rifle at a known range (say 50 yards). Note the distance you need the impact to change (say 6 inches lower).

2. Measure the sight radius of your rifle (22 inches on most Marlins).

3. The change needed is calculated by changing all measurements to inches then multiply the sight radius by the desired change in impact and divide that product by the range in inches.

4. The result is the additional height needed for the front sight. To get the height of the new front sight add the current height and the calculated number from (3).

Example:

I need to shoot 6 inches lower at 50 yards with my 1894, 44 Mag. With a 22 inch sight radius. My current front sight is .350” tall from the bottom of the dovetail to the top of the sight.

50 yards = 50X36=1800 inches

Desired height change is = 22 (sight radius)X6 (desired change)/1800(range)=.073 inches. My new front sight needs to be .350+.073 or .423 inches tall.

 
 
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